A new inelastic neutron spectrometer HODACA

TL;DR

HODACA is a newly developed multiplex inelastic neutron spectrometer at JRR-3, offering significantly higher measurement efficiency for dynamics studies in physics and materials science.

Contribution

This paper introduces HODACA, a novel multiplex spectrometer with 24 detectors and 132 analyzer crystals, achieving 70 times greater efficiency than conventional spectrometers.

Findings

Successful commissioning experiments demonstrating performance

Measurement efficiency increased by a factor of 70

Suitable for a broad energy range of -1 to 7 meV

Abstract

A new multiplex-type inelastic neutron scattering spectrometer, HOrizontally Defocusing Analyzer Concurrent data Acquisition spectrometer (HODACA), was recently developed and built at the C1-1 cold neutron beam port in JRR-3. The spectrometer is suitable for dynamics measurements in the energy range of $-1$ meV $\lesssim \hbar \omega \lesssim$ 7 meV, catering to a broad array of research fields in physics and material science. HODACA combines 24 detectors and 132 pieces of analyzer crystals and has an estimated measurement efficiency that is 70 times greater than the existing conventional triple-axis spectrometer at the C1-1 beam port. The concept, design, specification, and results of commissioning experiments are described.